Attachment for squares.



L. M. HODGE.

ATTACHMENT FOR SQUARES.

APPLICATION FILED we. 30, 1 11.

Patented Sept. 10, 1912.

2 BHEETB-SHEET 1.

WITNESSES H J m L. M. HODGE.

ATTACHMENT FOR SQUARES.

APPLICATION FILED AUG. 30, 1911.

Patented Sept. 10, 1912.

2 SHEETS-SHEET 2.

I N VE TOR [00mm] nmM WITNESSES H A7.

ATTORNEYS clear, and exact description.

LEONARD MARION HODGE, or SAN JOSE, CALIFORNIA.

ATTACHMENT FOB SQUARES.

Specification of Letters Patent.

Patented Sept. 10, 1912.

Application filed August 30, 1911. Serial No. 646,822.

To all whom it may concern:

Be it known that I, LEONARD MARION House, a citizen of the United States, and a resident of San Jose, in the county of Santa Clara and State of California,have invented a new and Improved Att-achment.- ..-for Squares, of which the following is a full,

The invention relates to drawing instruments, and its object is to provide a new and improved attachment for steel squares such as are used by carpenters and other me 'chanics, and arranged to permit the user to set the attachment on the square for forming with the latter a templet, to indicate at one and the same time three cuts, namely,

the seat, the plumb and the side bevel,-

necessary to complete a jack or a hip rafter, none of the cuts interfering with the functions of the other or the convenient handling of the tool.

For the purpose mentioned use is made of a stock having clamping devices for clamping the stock to the members of a square, a graduated straight arm held on the stock and provided with an angular foot adapted to rest on one edge of one of the members of the square to'hold the arm at a right angle to the said square members, and a graduated segmental arm mounted to swing on the said stock and adapted to be fastened thereto.

A practical embodiment of the invention.

is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional elevation of the attachment in position on a square, the section being on the line l-1 of Fig. 2, Fig. 2 is a side elevation of the attachment 1n position on a rafter, plate and stud; Fig. 3 .is a like view of the same as applied to a jack rafter for making a side out; and Fig. 4 is an enlarged side elevation of part of the stock and the graduated segmental arm.

The stock A is in the form of a straight bar, provided with a longitudinal slot B for the passage of the members C and C of an ordinary steel square C, such as is used by carpenters and other mechanics. Clamping screws D and E are held in longitudinal slots F and F formed in the portion A of the stock A, and the said clamping screws D and E are adapted to engage the members C and C of the square C to securely fasten the same in position on the stock A. When the clamping screws D and E are loosened, the stock A and the square C can be adjusted one relative to the other so as to bring the side edge A of the stock A in the desired position relative to the linear graduations marked on the members C and C of the square C, as indicated in Fig. 2. The edge A intersects the 12-inch mark on the member. C and the 8-inch mark on the member C but the stockA can be adjusted relative to the square C to indicate any desired proportion. A straight arm'G is provided with a slot G adapted to be engaged by a clamping screw H, also passing through a longitudinal slot I formed in the stock A, so that the arm G can be adjusted to any desired position lengthwise of the stock A and also shifted laterally relative to the stock A owing to the slot G. On one side of the arm G is arranged an integral foot G standing at right angles to the arm and adapted to rest on the inner edge of the member C or C so as to hold the arm G at which the foot G is in engagement at the time. The arm G is also provided with a linear graduation G indicating inches. A segmental arm J is adapted to pass laterally through the slot B and is provided with a radial arm J pivoted at its free end at J on the stock A, and the said segmental arm J is adapted to be clamped in position on the stock A by a clamping screw K held on the said stock. The segmental arm J is provided with graduations L indicatin .the side cuts of the different forms of ra ters, as will be readily understood by reference to Fig. 4.

In using the attachment to form a hip and valley roof having a rise of 8 inches to one foot of run, the stock A is attached to the square C with the edge A at the 12 and 8 inch marks on the graduations of the members C and C of the square C, as indicated in Fig. 2. It is understood that when the stock and the square C are adjusted one relative to the other to the desired position, then the stock A and the square C are firmly fastened. together by the clamping screws D and E. The square C is now placed against the side of the rafter N, as plainly indicated in Fig. 2, with the stock A resting on the top edge or back of the rafter. The outer edge of the member C of the square C now gives the plumb cut N at the ridge, and

a right angle to the member C or C with 'the outer edge of the member C gives the so that its foot Gr rests on the inner ed 'e of the member C, and the graduation ('3 indicates that the rise at the heel or outside of the plate is to be three inches. It is also understood that the amount of the rise is read with the zero of the graduation G3 at the outer edge of the member C and with the three inches intersecting at the inner edge A of the stock A.

When it is desired to cut jack rafters for a square roof then the segmental plate J is adjusted on the stock A until the numeral 8 for Sqrf jack side cuts on the graduation L coincides with the inner edge A of the stock A, as indicated inFig. 4, and when the attachment and square are now placed in position on therafter Q, as indicated in ig. .3, then the cut Q along the outer edge of the radial arm J is the desired one for a jack rafter. By a similar use the device may be adjusted to lay out the hip, that is, by ad'justin the stock on the member C of the square until the stock coincides with the 17-inch mark instead of the 12-inch mark, the adjustment on the member C remaining the same at 8 inches. The arms G and J are now readjusted and the arm J set the desired cuts without interference of one edge with another.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. An attachment for squares, comprising a stock provided with clamping means for fastening thestock to a square, a graduated straight arm adjustably held on the said stock and provided-with an angular foot adapted to rest on an edge of the square to hold the said arm at a rightangle to the square, and a segmental graduated member formed at the end of a radial arm pivoted at its free end intermediatethe ends of the stock and adapted to be fastened thereon.

2. An attachment for squares, comprising a stock slotted to receive the square and provided with clamping means for adjustably clamping the stock to the square, the stock having a longitudinal slot, at a point between its ends an arm associated with the stock and having a linear graduation and provided with a longitudinal slot, said arm also having an angular foot at a point between its ends adapted to rest on an edge of a square to hold the arm at. a right-angle to the square, and a clamping screw engaging the said stock and arm and extending throu h the said longitudinal slots thereof.

3. attachment for squares, comprising a stock provided with clamping means for clamping the stock to a square, said stock having a longitudinal slot at a point between its ends, an 'arm asociated with the stock and having a linear graduation and provided with a longitudinal slot, said arm also having an angular'foot adapted to rest on an edge of the square to hold the arm at a right-angle to theisquare, a clamping screw engaging the said stock and arm and extending through the longitudinal slots thereof, a segmental arm carried by one end of a radial arm, the opposite end of which radial arm is pivoted on the stock intermediate the ends of the latter, said segmental arm having a graduation representing cuts for rafters, and a clamping screw for 

